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https://issues.apache.org/jira/browse/HTTPCORE-390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15720141#comment-15720141
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Gary Gregory commented on HTTPCORE-390:
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Agreed. I mention it because a sufficiently tunable pooling or sharing library
is hard to get 100% right and the two I mention have been around a while. I do
not have plans to create such extentions ATM.
> Lock-less connection pools
> --------------------------
>
> Key: HTTPCORE-390
> URL: https://issues.apache.org/jira/browse/HTTPCORE-390
> Project: HttpComponents HttpCore
> Issue Type: Improvement
> Components: HttpCore NIO
> Affects Versions: 4.3.2
> Reporter: Stephane Routhiau
> Labels: concurrency, performance
> Fix For: 5.0
>
> Attachments: AbstractNIOConnPool.java, ConcurrentLinkedQueue.java,
> DefaultConnectingIOReactor.java, RouteSpecificPool.java,
> SessionRequestCallback.java, contention on lease and release.png,
> patch-performance nio pool.patch
>
>
> AbstractNIOConnPool use a ReentrantLock for lease and release connection.
> We have noticed important contention when we try to use hundreds of
> connexions to the same host, the lock is to vast.
> I managed to rework a part of the code so there is no more use of a
> ReentrantLock, but use of ConcurrentHashMap and so on.
> The unit tests are ok and the load tests we have made on the patch version
> are about 40 % faster under heavy load
> Please find attached patch file againt http-nio 4.3.2 and the modified
> sources files of http-nio 4.3.2
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